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Efficient perovskite light-emitting diodes based on a solution-processed tin dioxide electron transport layer.

Heyong Wang1, Hongling Yu1, Weidong Xu1

  • 1Department of Physics , Chemistry and Biology (IFM) , Linköping University , Linköping 58183 , Sweden . Email: xiaoke.liu@liu.se ;

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Solution-processed tin oxide (SnO2) serves as an efficient electron transport layer for high-performance perovskite light-emitting diodes (PeLEDs). This novel approach enhances perovskite film morphology and charge transport, achieving a 7.9% external quantum efficiency.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • High-performance perovskite light-emitting diodes (PeLEDs) require optimized functional layers for improved film morphology and charge transport.
  • Commonly used electron transport layers (ETLs) like zinc oxide (ZnO) have limitations in chemical compatibility and performance enhancement.

Purpose of the Study:

  • To investigate the efficacy of solution-processed tin oxide (SnO2) as an electron transport layer (ETL) in n-i-p structured PeLEDs.
  • To evaluate the chemical compatibility of SnO2 with different perovskite materials and its impact on device performance.
  • To explore the effects of interfacial materials on SnO2-based PeLEDs.

Main Methods:

  • Fabrication of n-i-p structured PeLEDs utilizing solution-processed SnO2 as the ETL.
  • Chemical compatibility studies between SnO2 and three-dimensional perovskites (e.g., formamidinium lead iodide, methylammonium lead iodide).
  • Characterization of SnO2 properties including transparency, morphology, and energy levels.
  • Systematic investigation of interfacial material effects on SnO2-based PeLEDs.

Main Results:

  • SnO2 demonstrates superior chemical compatibility with three-dimensional perovskites compared to ZnO.
  • SnO2 exhibits favorable properties such as good transparency, excellent morphology, and suitable energy levels for PeLED applications.
  • A high external quantum efficiency (EQE) of 7.9% was achieved in SnO2-based PeLEDs.
  • Interfacial materials, while beneficial for ZnO-based PeLEDs, showed detrimental effects (photoluminescence quenching) on SnO2-based devices.

Conclusions:

  • Solution-processed SnO2 is a promising ETL for both three- and low-dimensional PeLEDs.
  • SnO2 offers advantages over ZnO in terms of chemical stability and performance for specific perovskite compositions.
  • Further research is needed to understand and mitigate the photoluminescence quenching observed with interfacial materials on SnO2.